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https://www.readbyqxmd.com/read/29017022/isometric-parameters-in-the-monitoring-of-maximal-strength-power-and-hypertrophic-resistance-training
#1
Heikki Peltonen, Simon Walker, Anuliisa Lähitie, Keijo Häkkinen, Janne Avela
This study monitored strength-training adaptations via isometric parameters throughout 2×10 weeks of hypertrophic (HYP I+II) or 10 weeks maximum strength (MS) followed by 10 weeks power (P) training with untrained controls. Previously untrained men performed bilateral isometric leg press tests analyzed for peak force (MVC) and rate of force development (RFD) every 3.5-week. These parameters were compared to dynamic performance, voluntary and electrically-induced isometric contractions, muscle activity and cross-sectional area (CSA) in the laboratory before and after 10 and 20 weeks...
October 10, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28937244/cardiac-at1-receptor-dependent-and-igf1-receptor-independent-signaling-is-activated-by-a-single-bout-of-resistance-exercise
#2
S Fs Melo, V G Barauna, T Fernandes, E C Carmo, C Ro Carvalho, E M Oliveira
AT1 receptor (AT1R) blockade prevents physiological cardiac hypertrophy induced by resistance training. Also, our group showed that a single bout of resistance exercise (RE) activates the AKT/mTOR which was also inhibited by AT1R blocker. Here, we investigated whether IGF1-receptor (IGF1-R) and MAPKs were also activated after a single bout of RE. Wistar rats were divided into Sedentary (SED); Sedentary treated with losartan (SED+LOS); Exercise (EX); and Exercise treated with losartan (EX+LOS). Cardiac tissue was obtained 5 and 30 minutes after 4 sets of 12 repetitions of squat exercise (80%1RM)...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28914426/resistance-training-status-modifies-inflammatory-response-to-explosive-and-hypertrophic-resistance-exercise-bouts
#3
Johanna K Ihalainen, Juha P Ahtiainen, Simon Walker, Gøran Paulsen, Harri Selänne, Mari Hämäläinen, Eeva Moilanen, Heikki Peltonen, Antti A Mero
The purpose of the present study was to examine the immediate and prolonged immune response in circulating cytokine and adipocytokine concentrations after two different resistance exercise bouts: hypertrophic (HYP1, 5 × 10, 80% of 1RM) and maximal explosive (POW1, 10 × 5, 60% of 1RM) resistance exercise bouts and how 12 weeks of resistance training (RT) modifies these responses (HYP2, POW2). Eight men completed the study. RE-induced interleukin-6 (IL-6), interleukin-1β (IL-1β), interleukin-1 receptor antagonist (IL-1ra), monocyte-chemoattractant protein-1 (MCP-1), leptin, resistin, and adiponectin were measured before (PRE) and immediately (POST0), 24 (POST24) and 48 (POST48) hours after RE bouts before and after RT...
September 15, 2017: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28903763/troponin-as-ischemic-biomarker-is-related-with-all-three-echocardiographic-risk-factors-for-sudden-death-in-hypertrophic-cardiomyopathy-esc-guidelines-2014
#4
Rafał Hładij, Renata Rajtar-Salwa, Paweł Petkow Dimitrow
BACKGROUND: Sudden cardiac death (SCD) risk stratification is the most important preventive action in patients with hypertrophic cardiomyopathy (HCM). The identification of the ischemia biomarker high sensitive troponin I (hs-TnI) role for this arrhythmic disease may provide additional information for SCD risk stratification. The aim of the study was to compare echocardiographic parameters (prognostic for risk stratification of SCD in HCM) among two subgroups of HCM patients: with elevated hs-TnI versus non-elevated hs-TnI level...
September 13, 2017: Cardiovascular Ultrasound
https://www.readbyqxmd.com/read/28871552/lessons-from-a-tarantula-new-insights-into-myosin-interacting-heads-motif-evolution-and-its-implications-on-disease
#5
REVIEW
Lorenzo Alamo, Antonio Pinto, Guidenn Sulbarán, Jesús Mavárez, Raúl Padrón
Tarantula's leg muscle thick filament is the ideal model for the study of the structure and function of skeletal muscle thick filaments. Its analysis has given rise to a series of structural and functional studies, leading, among other things, to the discovery of the myosin interacting-heads motif (IHM). Further electron microscopy (EM) studies have shown the presence of IHM in frozen-hydrated and negatively stained thick filaments of striated, cardiac, and smooth muscle of bilaterians, most showing the IHM parallel to the filament axis...
September 4, 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/28862673/igf-1-attenuates-hypoxia-induced-atrophy-but-inhibits-myoglobin-expression-in-c2c12-skeletal-muscle-myotubes
#6
Eva L Peters, Sandra M van der Linde, Ilse S P Vogel, Mohammad Haroon, Carla Offringa, Gerard M J de Wit, Pieter Koolwijk, Willem J van der Laarse, Richard T Jaspers
Chronic hypoxia is associated with muscle wasting and decreased oxidative capacity. By contrast, training under hypoxia may enhance hypertrophy and increase oxidative capacity as well as oxygen transport to the mitochondria, by increasing myoglobin (Mb) expression. The latter may be a feasible strategy to prevent atrophy under hypoxia and enhance an eventual hypertrophic response to anabolic stimulation. Mb expression may be further enhanced by lipid supplementation. We investigated individual and combined effects of hypoxia, insulin-like growth factor (IGF)-1 and lipids, in mouse skeletal muscle C2C12 myotubes...
September 1, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28834248/high-doses-of-anti-inflammatory-drugs-compromise-muscle-strength-and-hypertrophic-adaptations-to-resistance-training-in-young-adults
#7
M Lilja, M Mandić, W Apró, M Melin, K Olsson, S Rosenborg, T Gustafsson, T R Lundberg
AIMS: This study tested the hypothesis that high doses of anti-inflammatory drugs would attenuate the adaptive response to resistance training compared with low doses. METHODS: Healthy men and women (aged 18-35 years) were randomly assigned to daily consumption of ibuprofen (IBU; 1200 mg; n = 15) or acetylsalicylic acid (ASA; 75 mg; n = 16) for 8 weeks. During this period, subjects completed supervised knee-extensor resistance training where one leg was subjected to training with maximal volitional effort in each repetition using a flywheel ergometer (FW), while the other leg performed conventional (work-matched across groups) weight-stack training (WS)...
August 21, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28725197/skeletal-muscle-remodeling-in-response-to-eccentric-vs-concentric-loading-morphological-molecular-and-metabolic-adaptations
#8
REVIEW
Martino V Franchi, Neil D Reeves, Marco V Narici
Skeletal muscle contracts either by shortening or lengthening (concentrically or eccentrically, respectively); however, the two contractions substantially differ from one another in terms of mechanisms of force generation, maximum force production and energy cost. It is generally known that eccentric actions generate greater force than isometric and concentric contractions and at a lower metabolic cost. Hence, by virtue of the greater mechanical loading involved in active lengthening, eccentric resistance training (ECC RT) is assumed to produce greater hypertrophy than concentric resistance training (CON RT)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28673573/exercise-for-type-1-diabetes-mellitus-management-general-considerations-and-new-directions
#9
Juliano Boufleur Farinha, Maurício Krause, Josianne Rodrigues-Krause, Alvaro Reischak-Oliveira
Type 1 diabetes mellitus (T1DM) is characterized by the loss of insulin secreting cells due to a directed autoimmune process, which is linked to oxidative stress and inflammation. Exercise training is known to induce several benefits by reducing inflammation and improving antioxidant defenses. In this context, exercise training may be considered as an efficient and relatively inexpensive non-pharmacological tool for diabetes treatment, added to the usual insulin administration. Unfortunately, most people with T1DM do not reach the recommended levels of physical activity due to concerns with hypoglycemic episodes...
July 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28641044/the-effects-of-short-versus-long-inter-set-rest-intervals-in-resistance-training-on-measures-of-muscle-hypertrophy-a-systematic-review
#10
Jozo Grgic, Bruno Lazinica, Pavle Mikulic, James W Krieger, Brad Jon Schoenfeld
Although the effects of short versus long inter-set rest intervals in resistance training on measures of muscle hypertrophy have been investigated in several studies, the findings are equivocal and the practical implications remain unclear. In an attempt to provide clarity on the topic, we performed a systematic literature search of PubMed/MEDLINE, Scopus, Web of Science, Cochrane Library, and Physiotherapy Evidence Database (PEDro) electronic databases. Six studies were found to have met the inclusion criteria: (a) an experimental trial published in an English-language peer-reviewed journal; (b) the study compared the use of short (≤60 s) to long (>60 s) inter-set rest intervals in a traditional dynamic resistance exercise using both concentric and eccentric muscle actions, with the only difference in resistance training among groups being the inter-set rest interval duration; (c) at least one method of measuring changes in muscle mass was used in the study; (d) the study lasted for a minimum of four weeks, employed a training frequency of ≥2 resistance training days per week, and (e) used human participants without known chronic disease or injury...
September 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28639774/-discovery-of-left-ventricular-hypertrophy-during-adult-echocardiography
#11
Nicolas B Dayal, Hajo Müller
Left ventricular hypertrophy is a common finding during echocardiography. A precise evaluation of the left ventricular wall thickness, ventricular mass and distribution of hypertrophy is crucial both for diagnostic workup, follow-up and for prognostic evaluation. The differential diagnosis of left ventricular hypertrophy includes hypertrophic cardiomyopathies, hypertrophy secondary to abnormal left ventricular filling conditions, hypertrophy linked to intense physical training and the isolated basal septal hypertrophy of the elderly...
May 24, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28630576/no-effect-of-a-whey-growth-factor-extract-during-resistance-training-on-strength-body-composition-or-hypertrophic-gene-expression-in-resistance-trained-young-men
#12
Michael J Dale, Alison M Coates, Peter R C Howe, Grant R Tomkinson, Matthew T Haren, Andrew Brown, Marissa Caldow, David Cameron-Smith, Jonathan D Buckley
Growth factors can be isolated from bovine milk to form a whey growth factor extract (WGFE). This study examined whether WGFE promoted activation of the AKT/mTOR pathway enabling increased lean tissue mass and strength in resistance trained men. Forty six men with >6 months of resistance training (RT) experience performed 12 weeks of RT. Participants consumed 20 g/day of whey protein and were randomised to receive either 1.6 g WGFE/day (WGFE; n = 22) or 1.6 g cellulose/day (control, CONT; n = 24). The primary outcome was leg press one-repetition maximum (LP1-RM) which was assessed at baseline, 6 and 12 weeks...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28610577/coronary-angiogenic-effect-of-long-term-administration-of-nigella-sativa
#13
Lubna I Al Asoom
BACKGROUND: Coronary angiogenesis is one of the preferable adaptive responses of aerobic training. Previous studies found inotropic and hypertrophic cardiac effects for long-term administration of Nigella sativa (NS), but no studies have explored its coronary angiogenic effect. The present study compared the effect of long-term NS- administration and exercise training on the induction of coronary angiogenesis. METHOD: Fifteen adult male Wistar rats were divided into three groups: control, NS-fed, and exercise-trained (Ex)...
June 13, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28606196/prescribing-an-automated-external-defibrillator-for-children-at-increased-risk-of-sudden-arrhythmic-death
#14
Karen A McLeod, Eileen Fern, Fiona Clements, Ruth McGowan
BACKGROUND: Automated external defibrillators can be life-saving in out-of-hospital cardiac arrest. OBJECTIVE: Our aim was to review our experience of prescribing automated external defibrillators for children at increased risk of sudden arrhythmic death. METHODS: We reviewed all automated external defibrillators issued by the Scottish Paediatric Cardiac Electrophysiology Service from 2005 to 2015. All parents were given resuscitation training according to the Paediatric Resuscitation Guidelines, including the use of the automated external defibrillator...
September 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/28486337/hypertrophic-effects-of-concentric-vs-eccentric-muscle-actions-a-systematic-review-and-meta-analysis
#15
Brad J Schoenfeld, Dan I Ogborn, Andrew D Vigotsky, Martino V Franchi, James W Krieger
Schoenfeld, BJ, Ogborn, DI, Vigotsky, AD, Franchi, MV, and Krieger, JW. Hypertrophic effects of concentric vs. eccentric muscle actions: A systematic review and meta-analysis. J Strength Cond Res 31(9): 2599-2608, 2017-Controversy exists as to whether different dynamic muscle actions produce divergent hypertrophic responses. The purpose of this paper was to conduct a systematic review and meta-analysis of randomized controlled trials comparing the hypertrophic effects of concentric vs. eccentric training in healthy adults after regimented resistance training (RT)...
September 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28444456/free-leucine-supplementation-during-an-8-week-resistance-training-program-does-not-increase-muscle-mass-and-strength-in-untrained-young-adult-subjects
#16
Andreo Fernando Aguiar, Alan Pablo Grala, Rubens Alexandre da Silva, Lúcio Flávio Soares-Caldeira, Francis Lopes Pacagnelli, Alex Silva Ribeiro, Douglas Kratki da Silva, Walquíria Batista de Andrade, Mario Carlos Welin Balvedi
The purpose of this study was to examine the effects of free leucine supplementation on changes in skeletal muscle mass and strength during a resistance training (RT) program in previously untrained, young subjects. In a double-blind, randomized, placebo-controlled study, 20 healthy young (22 ± 2 years) participants were assigned to two groups: a placebo-supplement group (PLA, N = 10) or a leucine-supplement group (LEU, N = 10). Both groups underwent an 8-week hypertrophic RT program (2 days/week), consuming an equivalent amount of leucine (3...
April 25, 2017: Amino Acids
https://www.readbyqxmd.com/read/28315193/resistance-training-using-different-hypoxic-training-strategies-a-basis-for-hypertrophy-and-muscle-power-development
#17
REVIEW
Belén Feriche, Amador García-Ramos, Antonio J Morales-Artacho, Paulino Padial
The possible muscular strength, hypertrophy, and muscle power benefits of resistance training under environmental conditions of hypoxia are currently being investigated.Nowadays, resistance training in hypoxia constitutes a promising new training strategy for strength and muscle gains. The main mechanisms responsible for these effects seem to be related to increased metabolite accumulation due to hypoxia. However, no data are reported in the literature to describe and compare the efficacy of the different hypertrophic resistance training strategies in hypoxia...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28306757/effect-of-moderate-intensity-exercise-training-on-peak-oxygen-consumption-in-patients-with-hypertrophic-cardiomyopathy-a-randomized-clinical-trial
#18
RANDOMIZED CONTROLLED TRIAL
Sara Saberi, Matthew Wheeler, Jennifer Bragg-Gresham, Whitney Hornsby, Prachi P Agarwal, Anil Attili, Maryann Concannon, Annika M Dries, Yael Shmargad, Heidi Salisbury, Suwen Kumar, Jonathan J Herrera, Jonathan Myers, Adam S Helms, Euan A Ashley, Sharlene M Day
Importance: Formulating exercise recommendations for patients with hypertrophic cardiomyopathy is challenging because of concern about triggering ventricular arrhythmias and because a clinical benefit has not been previously established in this population. Objective: To determine whether moderate-intensity exercise training improves exercise capacity in adults with hypertrophic cardiomyopathy. Design, Setting, and Participants: A randomized clinical trial involving 136 patients with hypertrophic cardiomyopathy was conducted between April 2010 and October 2015 at 2 academic medical centers in the United States (University of Michigan Health System and Stanford University Medical Center)...
April 4, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28258593/hypertrophic-cardiomyopathy-in-youth-athletes-successful-screening-with-point-of-care-ultrasound-by-medical-students
#19
J Christian Fox, Shadi Lahham, Graciela Maldonado, Suzi Klaus, Bassil Aish, Lauren V Sylwanowicz, Justin Yanuck, Sean P Wilson, Mason Shieh, Craig L Anderson, Carter English, Ryan Mayer, Uthara R Mohan
OBJECTIVES: Hypertrophic cardiomyopathy (HCM) is a life-threatening genetic cardiovascular disease that often goes undetected in young athletes. Neither history nor physical examination are reliable to identify those at risk. The objective of this study is to determine whether minimally trained medical student volunteers can use ultrasound to screen for HCM. METHODS: This was a prospective enrollment of young athletes performed at 12 area high schools and three area colleges, between May 2012 and August 2013...
June 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28193509/pilot-study-analyzing-automated-ecg-screening-of-hypertrophic-cardiomyopathy
#20
Matthew J Campbell, Xuefu Zhou, Chia Han, Hedayat Abrishami, Gregory Webster, Christina Y Miyake, Christopher T Sower, Jeffrey B Anderson, Timothy K Knilans, Richard J Czosek
BACKGROUND: Hypertrophic cardiomyopathy (HCM) is one of the leading causes of sudden cardiac death in athletes. However, preparticipation ECG screening has often been criticized for failing to meet cost-effectiveness thresholds, in part because of high false-positive rates and the cost of ECG screening itself. OBJECTIVE: The purpose of this study was to assess the testing characteristics of an automated ECG algorithm designed to screen for HCM in a multi-institutional pediatric cohort...
June 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
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